serialize method

@override Future<void> serialize(String logicalPath, Future<void> op())

Serialize a read-modify-write against everything else touching the same logical path — captures against each other, and captures against the sync engine's compare-and-swap.

Implementation

@override
Future<void> serialize(String logicalPath, Future<void> Function() op) {
  final prev = _chains[logicalPath] ?? Future<void>.value();
  final next = prev.then((_) => op()).catchError((Object e) {
    debugPrint('[EmbedCache] op failed for $logicalPath: $e');
  });
  _chains[logicalPath] = next;
  next.whenComplete(() {
    if (identical(_chains[logicalPath], next)) _chains.remove(logicalPath);
  });
  return next;
}